Lower s-Wythoff sequence, where s(n)=3n. Complement of A001956. 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15, 16, 18, 19, 20, 22, 23, 24, 26, 27, 28, 29, 31, 32
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